Case study:Habitat improvement measures in Bortneelva: Difference between revisions
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|Project summary=Svelgen Kraft (SK) | |Project summary=Svelgen Kraft (SK) use about 7% of the water that flows naturally in the Bortne-river for power production at the Svelgen I power plant. The measures carried out in the river were planned to mitigate the impacts of the power production and hoped to enhance the growing and living conditions for anadromous fish in the river. | ||
At the request of landowners and a dialogue with the County Governor's environmental protection department | At the request of landowners and after a dialogue with the County Governor's environmental protection department and in the light of the EU's water framework directive and renewal of the concessions for the Svelgen I and II power plants, as well as SK's goal of operating environmentally sound water management, mapping and improvement works were prioritized. The survey was carried out by Uni Research Miljø LFI in 2016. Habitat conditions in the river were described and possible measures were suggested to improve the fish's growing and living conditions. | ||
After clarification with landowners, other operators in the river and relevant authorities, the physical work was carried out in autumn/winter 2016-17 by Machine3prenør1. Different types of measures | After clarification with landowners, other operators in the river and the relevant authorities, the physical work was carried out in autumn/winter 2016-17 by Machine3prenør1. Different types of measures were carried out over an approximately 2 km long stretch of river. | ||
The following measures were done: | The following measures were done: | ||
Revision as of 22:53, 13 January 2020
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Project overview
| Status | Complete |
|---|---|
| Project web site | http://www.vannportalen.no/vannregioner/sogn--og-fjordane/vassomrade/nordfjord/nyhende-nordfjord/2017/miljotiltak-i-bortneelva/ |
| Themes | Environmental flows and water resources, Habitat and biodiversity, Hydropower, Hydromorphology, Monitoring |
| Country | Norway |
| Main contact forename | Vegard |
| Main contact surname | Fagerli |
| Main contact user ID | |
| Contact organisation | SFE Produksjon AS |
| Contact organisation web site | http://sfe.no/konsern |
| Partner organisations | Svelgen Kraft AS, The Norwegian Public Roads Administration, County Governor of Vestland, Sub-district (Vannområde) Nordfjord /Bremanger municipality, Uni Research Miljø LFI, Rådgivende Biologer AS |
| Parent multi-site project | |
| This is a parent project encompassing the following projects |
No |
Project summary
Svelgen Kraft (SK) use about 7% of the water that flows naturally in the Bortne-river for power production at the Svelgen I power plant. The measures carried out in the river were planned to mitigate the impacts of the power production and hoped to enhance the growing and living conditions for anadromous fish in the river.
At the request of landowners and after a dialogue with the County Governor's environmental protection department and in the light of the EU's water framework directive and renewal of the concessions for the Svelgen I and II power plants, as well as SK's goal of operating environmentally sound water management, mapping and improvement works were prioritized. The survey was carried out by Uni Research Miljø LFI in 2016. Habitat conditions in the river were described and possible measures were suggested to improve the fish's growing and living conditions.
After clarification with landowners, other operators in the river and the relevant authorities, the physical work was carried out in autumn/winter 2016-17 by Machine3prenør1. Different types of measures were carried out over an approximately 2 km long stretch of river.
The following measures were done:
• Removal of migration barriers by building a “fish passage” with two ponds.
• Construction of flow deflectors to concentrate the stream of water in the river, which gives the fish easier migration paths in the case of low water levels.
• Laying of stone blocks and boulders in clusters to improve the fish's ability to hide.
• Digging of ditches and opening of a natural "fish tunnels" to drain water to migration paths at low water levels.
Monitoring surveys and results
https://www.radgivende-biologer.no/wp-content/uploads/2019/10/2910.pdf
https://docplayer.me/50826638-Habitatkartlegging-i-bortneelva-bremanger-kommune.html
Lessons learnt
Results so far:
Fish studies were conducted in 2018 by Rådgivende Biologer AS. Due to general low densities of juvenile fish in 2018, there were not enough data to say anything conclusive about the effects of the measures conducted in the river (Irgens, C. & Hellen, B.A. 2019. Fiskebiologiske undersøkelser i Bortneelva i 2018. Rådgivende Biologer AS, rapport 2910, 16 sider, ISBN 978-82-8308-63 3-1).
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Catchment and subcatchment
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Project background
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Reasons for river restoration
Measures
MonitoringHydromorphological quality elements
Biological quality elements
Physico-chemical quality elements
Any other monitoring, e.g. social, economic
Monitoring documents
Additional documents and videos
Additional links and references
Supplementary InformationEdit Supplementary Information
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